1. Caterpillar Filters and Fluids Ultra Low Sulfur Diesel Fuel Requirements

2. Caterpillar Filters and Fluids Diesel Fuel Sulfur Reduction 1993 2006 Fuel Sulfur 500 ppm On-Highway Fuel Sulfur 15 ppm On-Highway – Oct 15 All 2007 engines will require EPA- Refinery Limits 80% – 15 ppm 20% – 500 ppm (off-highway use) 2010 Fuel Sulfur 15 ppm On and Off Highway Fuel Sulfur 5,000 ppm

3. Caterpillar Filters and Fluids New Ultra Low Sulfur Diesel fuel for use in locomotive, marine, and non-road engines and equipment offers significant air quality improvement. New EPA standards require a major reduction in the sulfur content of diesel fuel intended for use in locomotive, marine, and non-road engines and equipment, including construction, agricultural, industrial and airport equipment. EPA standards will reduce current sulfur levels from about 3,000 parts per million (ppm) to 15 ppm or less when fully implemented, a reduction greater than 99 percent. Starting in 2007, fuel sulfur levels in non-road diesel fuel will be limited to a maximum of 500 ppm. This includes fuels used in locomotive and marine applications (except marine residual fuel used by very large engines on ocean-going vessels). In 2010, fuel sulfur levels in most non-road diesel fuel will be reduced to 15 ppm, making it possible for engine manufacturers to use advanced emissions control systems that significantly reduce harmful emissions. For locomotive and marine fuel, this step will occur in 2012.

4. Caterpillar Filters and Fluids Nonroad Diesel Fuel Standards WhoCovered Fuel200620072008200920102011201220132014 Large Refiners & Importers NON-ROAD 500+ ppm 500 ppm 15 ppm Large Refiners & Importers LOCOMOTIVE & MARINE 500+ ppm 500 ppm 15 ppm Small Refiners and other exceptions NON-ROAD, LOCOMOTIVE AND MARINE 500+ ppm 500 ppm 15 ppm Except in CaliforniaExcept in California, compliance dates for Non-Road, Locomotive and Marine fuels are: June 1 for refiners and importers, August 1 downstream from refineries through fuel terminals, October 1 for retail outlets, and December 1 for in-use In CaliforniaIn California, all diesel fuel will transition in 2006. Compliance dates for Non-Road fuels are: June 1 for refiners and importers, July 15 downstream from refineries through fuel terminals, and September 1 for retail outlets. Locomotive and Marine diesel fuels must transition to 15 ppm ULSD by January 1, 2007

5. Caterpillar Filters and Fluids The transition to ULSD for highway vehicles began in June 2006. More than 90 percent of highway diesel fuel in the United States currently is ULSD and by 2010, all highway diesel fuel will be ULSD. Diesel engines equipped with advanced emission control devices must use ULSD fuel to prevent damage to these new technologies. Exhaust emissions from these engines will decrease by more than 90 percent. Federal regulations require the labeling of all diesel fuel pumps to specify the type of fuel dispensed by each pump.

6. Caterpillar Filters and Fluids

8. Frequently Asked Questions about ULSD use and Caterpillar Engines This information is being incorporated into the following publications:  Caterpillar Machine Fluids Recommendations – SEBU6250  Caterpillar Commercial Diesel Engine Fluids Recommendations – SEBU6251  Caterpillar On-highway Diesel Truck Engine Fluid Recommendations – SEBU6385

9. Caterpillar Filters and Fluids What is ULSD and how is it different from Low Sulfur Diesel Fuel (LSD)? The United States (U.S.) Environmental Protection Agency (EPA) defines Ultra-Low Sulfur Diesel (ULSD – S15) as a U.S. diesel fuel with a sulfur content not to exceed 15 ppm (parts per million) or 0.0015% by weight. Low Sulfur Diesel (LSD – S500) is defined as a U.S. diesel fuel with sulfur content not to exceed 500 ppm or 0.05% by weight. The LSD fuel commonly available in North America normally does not exceed 350 ppm sulfur. Both, ULSD and LSD should meet the fuel requirements outlined in ASTM D975-06. Why is the sulfur content of diesel fuel in the U.S. reduced to 15 ppm? ULSD is required by U.S. EPA regulations for highway vehicles to ensure that these vehicles will meet emissions standards to improve air quality. In California, other properties of vehicular diesel fuel are also controlled to help reduce smog.

10. Caterpillar Filters and Fluids Can I use LSD fuel in model year (MY) 2010 or later engines? Non-road diesel engines built in 2010 and later model years must operate with ULSD fuel to comply with the U.S. EPA regulations. Using LSD fuel in 2010 and later model year diesel engines powering non-road vehicles is illegal and punishable with civil penalties. Fuel sulfur above 15 ppm can reduce the efficiency and durability of the engine. The potential impact may include permanent damage to the emissions control systems, reduced fuel economy and more frequent regeneration events. Engine failures resulting from improper fuel usage are not Caterpillar Factory defects and the cost of repair is not covered by a Caterpillar warranty. Can ULSD be used in engines built before 2010? Non-road vehicles powered by MY2010 and later low-emissions diesel engines must use only ULSD fuel. Owners of 2009 and earlier model year diesel engines may use ULSD or LSD fuel. In the U.S., only ULSD fuel will be available for use starting in 2014.

11. Caterpillar Filters and Fluids Should I be concerned with the lubricity of ULSD? Diesel fuel lubricity is necessary to minimize wear on fuel pumps and injectors. ULSD fuel requires good lubricity and corrosion inhibitors to prevent unacceptable engine wear. In the U.S., as necessary, additives to increase lubricity and to inhibit corrosion will be added to ULSD fuel prior to its retail sale. With these additives, ULSD fuel is expected to perform as well as LSD fuel. All Caterpillar Electronic engines produced since model year 2000 are qualified to run on ULSD fuel. NOTE: Have the fuel supplier confirm that the ULSD fuel available meets all ASTM D975-06 S15 requirements. In North America, diesel fuel that is identified as ASTM D975 Grade No. 2-D S15 or ASTM D975 Grade No. 1-D S15 and meeting the ASTM D975 Thermal Stability Guideline X2.10.2.2 generally meet the “Caterpillar Specification for Distillate Diesel Fuel” requirements for ULSD fuel.

12. Caterpillar Filters and Fluids Will a special color or dye identify the ULSD fuel? Due to the processing required to produce ULSD fuel, its color can vary widely from the traditional colorless to amber, to anything from a light toned green, yellow, orange or pink. Under certain light conditions, the color may appear to be slightly fluorescent. In the U.S., diesel fuel destined for off-highway use is required by law to be dyed RED. Use of this RED dyed fuel in on-highway applications is illegal. There are currently no regulations that require diesel fuel destined for on-highway use to be dyed. There is no relationship between the natural diesel fuel color and such desirable diesel fuel qualities as heat content, viscosity, cloud point, cetane number or distillation range. Diesel fuel color varies with the crude source, refinery methods and the use of dyes. However, if the fuel color darkens appreciably during storage, this could indicate oxidation and/or contamination from dirt, water, algae, bacteria, or other sources that can cause operational problems. Is there a cost difference between ULSD and LSD fuel? ULSD fuel costs more to refine and distribute than LSD fuel. No one can predict with certainty the price of ULSD fuel at the pump. Many factors affect the consumer price of fuels, including the price of crude oil on the global market, geopolitical, weather, transportation and economic events, as well as supply and demand. Visit the U.S. Energy Information Administration web site for more information on fuel prices. http://tonto.eia.doe.gov/oog/info/gdu/gasdiesel.asp

13. Caterpillar Filters and Fluids Does ULSD affect the fuel system seals? Caterpillar has completed its review of the engine fuel system technology and the system compatibility with ULSD fuel for on and off-highway products. Electronically controlled (ECM) engines, manufactured after 2000 and that have been properly maintained, are compatible with fuel with less than 50 ppm sulfur content and comply with ASTM D975-06 Grade No. 2-D S15 or ASTM D975-06 Grade No. 1- D S15. Refer to: “Caterpillar Commercial Diesel Engine Fluids Recommendations”, media number SEBU6251 -09 or later. Earlier engines including those with mechanical fuel systems should be watched for external leaks. It is anticipated that only a small number of fuel system seals may be affected. Leaks that do develop are expected to typically be experienced as minor seepage, slobber, or drips. If a leak should develop, a possible correction is to tighten the joint and/or connection to the proper torque. If a leak is detected, please contact your Cat® Dealer or authorized service center as soon as possible and schedule a repair. Whenever possible, use Viton seal material and hoses that are compatible with diesel fuel as your best defense against fuel system leaks. NOTE: Fuel additives will not stop or prevent seal leaks, seepage, slobber, or drips that result from transitioning to ULSD fuel.

14. Caterpillar Filters and Fluids Can I use the current Caterpillar fuel filters? Yes, ULSD fuel is fully compatible with current fuel filter technology. ULSD fuel has a tendency to clean fuel tanks and other fuel system parts efficiently, which may cause fuel filter plugging during the initial transition period. Several additional (more frequent) fuel filter changes may be required during the transition period from LSD to ULSD fuel. ULSD fuel typically has a slightly higher wax content that LSD fuel. Have your fuel supplier confirm that the fuel is blended to flow at the ambient temperatures being experienced in your region. In the U.S., diesel fuels are typically blended to provide cold performance per the guidelines provided in ASTM D975-06. More importantly, this brings us to fuel cleanliness at the facility level. ULSD will dissolve varnishes and deposits in your fuel storage and dispensing system. What maybe even harder to protect against, is the effect it will have on the sediment and water bottoms in the storage tanks. We have seen ULSD hold globules of settled out water and sediment in suspension for extended periods of time. These globules are then carried thru out the fuel system, eventually depositing themselves on the fuel filters causing them to plug prematurely. ULSD also has the ability to carry a larger amount of dissolved water. Hence making it a breeding ground for bacteria in systems that are poorly maintained and serviced.

15. Caterpillar Filters and Fluids The industry knows about the issues, and is working hard to correct them. The best solution is an active facility maintenance practice to insurance fuel cleanliness and quality.

16. Caterpillar Filters and Fluids Are aftermarket fuel additives recommended with ULSD? There are many different types of fuel additives. Caterpillar does not generally recommend the use of fuel additives. In special circumstances, Caterpillar recognizes the need for fuel additives. Fuel additives need to be used with caution. The additive may not be compatible with the fuel. Some additives may precipitate and cause deposits in the fuel system. The deposits may cause seizure. Some additives may plug fuel filters. Some additives may be corrosive, and some additives may be harmful to the elastomers in the fuel system. Some additives may damage emission control systems. Some additives may raise fuel sulfur levels above the maximum allowed by the U.S. EPA and/or, as appropriate, other regulatory agencies. Contact your fuel supplier for those circumstances when fuel additives are required. Your fuel supplier can make recommendations for additives to use and for the proper level of treatment. For best results, your fuel supplier should treat the fuel when additives are needed. Can Biodiesel fuel be blended as ULSD? Biodiesel can be blended as either LSD (up to 500 ppm sulfur) or as ULSD (up to 15 ppm sulfur). Refer to either the engine specific Operation and Maintenance Manual or to the for mentioned SEBU’s. These publications provide guidance concerning biodiesel usage, including the maximum percentage of biodiesel that is allowed for use by engine type and/or model. NOTE: The use of biodiesel fuels with 2007 on-highway, low-emissions engines is currently under review. The engine user has the responsibility of using the correct fuel that is recommended by the manufacturer and allowed by the U.S. EPA and other appropriate regulatory agencies.

17. Caterpillar Filters and Fluids Does ULSD affect Engine Performance and Fuel Economy? There is no measurable difference in performance and fuel economy for MY2007 heavy-duty engines. The slightly lower energy content of ULSD fuel is compensated by a slight increase in engine efficiency. The MY2007 mid-range engines will show between 0% to 4% improvements in fuel economy. Diesel fuel suppliers advise that the new ULSD fuel contains more wax, but will deliver 0% to 2% lower fuel economy (approximately 1% lower on average). How can this be? Diesel engine operators/truckers often consider the waxes found in diesel fuel as delivering most of the fuel’ s energy. This is assumed because lighter fuels such as No. 1D and kerosene do not typically have winter “wax” problems (cold filter plugging, high cloud point, etc.), and because No. 1D and kerosene give lower fuel economy. During desulfurization, a percentage of the fuels aromatic and naphthenic components are converted to less dense paraffinic waxes. There is now more wax, but the density of the fuel is lower. The lower fuel density of ULSD results in less energy per gallon.

18. Caterpillar Filters and Fluids What specification requirements of diesel fuel should concern me? Cetane number (ignition quality), cleanliness, low-temperature operability, stability, and lubricity are the diesel fuel requirements of principal concern to the end user. NOTE: ULSD has less conductivity than LSD. Follow all industry standard grounding and safety practices. NOTE: For applications where ULSD is required, have the fuel supplier confirm that the ULSD fuel available meets all ASTM D975-06 S15 requirements. In North America, diesel fuel that is identified as ASTM D975 Grade No. 2-D S15 or ASTM D975 Grade No. 1-D S15 and meeting the ASTM D975 Thermal Stability Guideline X2.10.2.2

19. Caterpillar Filters and Fluids Questions ??